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from .object cimport PyObject
cdef extern from *:
# Backport PyWeakref_GetRef to Python < 3.13
"""
#if PY_VERSION_HEX < 0x030d0000
static CYTHON_INLINE int __Pyx_PyWeakref_GetRef(PyObject *ref, PyObject **pobj)
{
PyObject *obj = PyWeakref_GetObject(ref);
if (obj == NULL) {
// SystemError if ref is NULL
*pobj = NULL;
return -1;
}
if (obj == Py_None) {
*pobj = NULL;
return 0;
}
Py_INCREF(obj);
*pobj = obj;
return 1;
}
#else
#define __Pyx_PyWeakref_GetRef PyWeakref_GetRef
#endif
"""
bint PyWeakref_GetRef "__Pyx_PyWeakref_GetRef" (object ref, PyObject** pobj)
# Get a strong reference to the referenced object from a weak reference,
# ref, into *pobj.
# - On success, set *pobj to a new strong reference to the referenced
# object and return 1.
# - If the reference is dead, set *pobj to NULL and return 0.
# - On error, raise an exception and return -1.
cdef extern from "Python.h":
bint PyWeakref_Check(object ob)
# Return true if ob is either a reference or proxy object.
bint PyWeakref_CheckRef(object ob)
# Return true if ob is a reference object.
bint PyWeakref_CheckProxy(ob)
# Return true if *ob* is a proxy object.
object PyWeakref_NewRef(object ob, object callback)
# Return a weak reference object for the object ob. This will
# always return a new reference, but is not guaranteed to create a
# new object; an existing reference object may be returned. The
# second parameter, callback, can be a callable object that
# receives notification when ob is garbage collected; it should
# accept a single parameter, which will be the weak reference
# object itself. callback may also be None or NULL. If ob is not
# a weakly-referencable object, or if callback is not callable,
# None, or NULL, this will return NULL and raise TypeError.
object PyWeakref_NewProxy(object ob, object callback)
# Return a weak reference proxy object for the object ob. This
# will always return a new reference, but is not guaranteed to
# create a new object; an existing proxy object may be returned.
# The second parameter, callback, can be a callable object that
# receives notification when ob is garbage collected; it should
# accept a single parameter, which will be the weak reference
# object itself. callback may also be None or NULL. If ob is not
# a weakly-referencable object, or if callback is not callable,
# None, or NULL, this will return NULL and raise TypeError.
PyObject* PyWeakref_GetObject(object ref) except NULL
# Return a borrowed reference to the referenced object from a weak
# reference, ref. If the referent is no longer live, returns None.
# Deprecated since Python 3.13, will be removed in version 3.15: Use
# PyWeakref_GetRef instead.
PyObject* PyWeakref_GET_OBJECT(object ref)
# Similar to PyWeakref_GetObject, but implemented as a macro that
# does no error checking.
# Deprecated since Python 3.13, will be removed in version 3.15: Use
# PyWeakref_GetRef instead.
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